Marshmallow cannot recognise some SIM cards. It keeps on rebooting.

[AC Question]

Upgraded to Marsmallow. Android keeps on rebooting. found out that some SIM cards are OK but some others cannot be recognised by Marsmaloow and thus it keeps on rebooting.

 

[belodion]

Have you tried a Cache Partition wipe, if possible on whatever device you have, or a Backup & Reset?